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Audio output driver and methods for use therewith

a technology of audio output and driver, which is applied in the direction of electrical transducers, gain control, transducer casings/cabinets/supports, etc., can solve the problem of noise generated when a devise is turned o

Active Publication Date: 2010-10-19
NXP USA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One concern with the implementation of integrated circuits is the noise generated when a devise is turned off and turned on.

Method used

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  • Audio output driver and methods for use therewith
  • Audio output driver and methods for use therewith
  • Audio output driver and methods for use therewith

Examples

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Embodiment Construction

[0018]FIG. 1 presents a pictorial view of a computer in accordance with an embodiment of the present invention. In particular, computer 100 includes audio output driver 150 for producing audio signals, such as music, speech signals, audio tracks of movies or other signals, that are stored in memory, on a disk, flash drive or other removable storage medium, or from a streaming source of audio content from an audio codec or other audio processing device. Audio output driver 150 provides an output signal to integrated speakers 102 and 104. In addition, computer 100 includes an external audio output 106 such as an output jack, for coupling the output signal to external audio output devices such as speakers, stereo systems, headphones, ear buds, or the like.

[0019]Audio output driver 150 includes various features and functions in accordance with the present invention that will be described in conjunction with the figures that follow.

[0020]FIG. 2 presents a block diagram representation of ...

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Abstract

An audio output driver includes an audio amplifier for generating an amplified signal. A virtual ground generator generates a virtual ground signal in response to a virtual ground reference. A combiner produces an output signal, based on the amplified signal and the virtual ground signal, that is coupled to an audio output device. A voltage equalizer equalizes the virtual ground reference and the output signal when the supply voltage compares unfavorably to a supply voltage threshold.

Description

CROSS REFERENCE TO RELATED PATENTS[0001]NoneBACKGROUND OF THE INVENTION[0002]1. Technical Field of the Invention[0003]The present invention relates to audio drivers as may be used in audio codecs, computers and related methods.[0004]2. Description of Related Art[0005]As is known, audio signals are processed by a wide variety of electronic equipment, including portable, or handheld, devices. Such devices include laptop, notebook and other personal computers, personal digital assistants (PDA), CD players, MP3 players, DVD players, AM / FM radio, cellular telephones, etc. Each of these devices includes one or more integrated circuits to provide the functionality of the device. As an example, a computer may include an audio codec integrated circuit to support the processing of audio signals in order to produce an audio output that is delivered to the user through speakers, headphones or the like.[0006]One concern with the implementation of integrated circuits is the noise generated when a...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04B15/00H03F99/00
CPCH03F1/305H03F2200/03H03F2200/414H03F2200/507H03F2200/78
Inventor KANJI, AJAYKUMAR
Owner NXP USA INC